Warp stop mechanism for looms



May 19, 1925.

3 Sheets-Sheet 1 EMS Filed Aug. 26, 1924 May 19, 1925.

H. A. DAVIS ET AL WAR P STOP MECHANISM FOR LOOMS Filed Aug 26, 1924 s Sheets-Sheet 2 MM, ATTORNEY H. A. DAVIS ET AL WARP STOP MECHANISM FOR LOOMS Filed Aug. 26, 1924 5 Sheets-Sheet 5 VENTOR' BY .I ATTORNEY Patented May 19, 1925.

HARRY A. DAVIS AND ARTHUR s. :romvsou, on

PATENT QFFICE.

HOPEDALE, MASSACHUSETTS, AS-

SIGNORS TO DRAPER CORPORATION, OF HOPEDALE, MASSACHUSETTS, A. CORPORA- TION OF MAINE.

WARP STOP MECHANISM FOR LOOMS.

Application filed August 26, 1924. Serial No. 734,234.

To all whom it may. concern.

Be it known that we, HARRY A. DAVIS and ARTHUR S. JOHNSON, citizens of the United States, residing in Hopedale, in the county of Worcester and State of Massachusetts, have invented'an Improvement in lVarp Stop Mechanisms for Looms, of

which the following description, in connec-- tion with the accompanying drawings, is a specification, like characters on the drawing representing like parts.

This invention relates to warp stop mechanisms for looms wherein a normally operated detecting member is adapted to be arrested in its movement when a Warp thread breaks or becomes too slack for weaving.

Mechanical warp stop mechanisms are of .two general types. One, in which the detecting member is given an oscillating or sliding movement in the general direction of the Warp threads or towards and from the front of the loom, and the other, in

which the detecting member is given move ments transversely of the warp threads. The present invention is adapted for use with either type, and while it is hereinafter described as associated with the second type, it isto be understood that it may be advaptageously employed or associated with cit ier.

One ot-tb'e objects of the presentdnvention is to provide a simple and effective construction of warp stop mechanism for imparting to the detecting member its detecting movements and for stopping the loom when a drop wire fails to be supported by a warp thread. In the present invention,

the detecting member will be described as .a toothed bar having a detecting movement transversely of the warp threads, although, as above stated, it may be utilized in association with detecting members having a different movement.

In accordance with the present disclosure of the invention, the transverse toothed bar is connected to a bar actuator which is mounted for tilting movement upon a rocker and controls a stop finger which, when the bar actuator is tilted on the rocker, eilects loom stoppage. Various novel featuresfof the invention and new combination of parts will bestbe made clear from the following description Fig. 2, to which and the accompanying drawings of one good form of the invention. In the drawings:

Fig. 1 is a sectional side elevation of a loom having the present invention associated therewith;

.Fig. 2 is an enlarged perspective ,view of one end portion of the warp stop mechanism constructed in accordance with the present invention;

Fig. 3 is an enlarged side elevation,some of the parts being broken away, showing the present warp stop mechanism;

Fig. 4 is a sectional View on the line 44 of Fig. 3; and

Fig. 5 shows-the relation of parts when one of the bar actuators is arrested in its movement with the rocker by the associated toothed bar.

In the illustrated form of the invention, four banks or rows of drop wires and associated toothed bars are shown, but it is mally rests an end 3 of a knock-oil lever pivoted at 4 and connected at 5 to the transmitter 6. The transmitter 6 is secured to a member 7 mounted at 8 upon a rocking link 9 pivotally supported at 10 on the loom frame. Also mounted for rocking movement about the center 8 is the dog 11 having an end portion 12 ada the hunter .13 mounted upon the lay'as the lay moves backward, as indicated in Fig. 1. A. light spring 14 overlies the dog 11 and normally holds it in inoperative position. -nuew the dog 11. is the end 15 of a flexible wire which is enclosed in a flexible sheath 16, the construction being such that should the flexible wire be moved longitudinally in its sheath it will operatively position the dog 11 tobe struck by the hunter 13 as the lay moves back, and when this occurs the transmitter 6 operates through the knock-off lever to stop the loom.

Rising from the loom frame 1 is'a supporting rod 17 which may be adjusted vertically in the supporting bracket 18. The rod 17 is surmounted by a bracket or cap 19,

pted to be struck by is adj ustably secured a bar indicated in Figs. 3 and 4.

- be locked from .vided with a or rod 20 which passes through a sleeve 21 projecting from the bracket or cap 19 and affords a support for a collar 22 which may be secured to the rod 20 in adjusted position, Figs. 2 and 3. Extending inwardly from the collar 22 is a boss 23 to which the side frame 24 of the warp stop motion is connected. The side frame 24 may be provided with the slot 25 for properly adjusting the side frames of the warp stop mechanism, and mounted in the lower part of the side frame 24 are the sockets 26, Figs. 2 and 3, for the bars 27, over which the warp threads a pass.

Extending downwardly from the hub 22 which, as previously stated, is secured to the stud 20, is the arm 28, Figs. 2, 3 and 4, for the support of a rock shaft 29. The arm 28 has a web portion 30 extending transversely of the banks of drop wires, and may be provided at the side of the web opposite the arm 28 with a similar arm 31, affording additional support for the rock shaft 29, as

The web portion 30 supports the ends of the fixed bars 32 in which are mounted for reciprocating movement the toothed bars 33 operatively connected by a stud 34' with the links 35, whereby the toothed bars 33 may be given their reciprocatingmovement. The toothed bars 33 are reciprocated in a slot in the fixed guide bars, which may also be provided with teeth on their upper edges, the construction being such that should a drop wire 36 through which the fixed and reciprocating bars pass, fail to be supported by a warp thread, the reciprocating bar will further movement, as usual in this type of machines. In the present instance, each of the drop wires 36 is prohole 37 through which the warp thread passes, in order to support the drop wires in their normal raised position.

The rock shaft 29, Figs. 2 and 3, has se cured thereto the arm 38 which is itself connected at its outer end to a stud 39 joined to anoperating rod '40 which may be given movement from any going part of the machine, in' order to rock the rock shaft 29.

Secured to the rock shaft 29 for rocking movement therewith is a series of rockers 41 upon which are mounted the bar actuators 42-, corresponding in number to thenumber 0t reciprocating toothed bars. As shown in the present instance of the invention, each bar actuator 42 is connected by a link 35 to a reciprocating toothed bar to which it is pivotally connected at 43, the construction. icing such that as the rockers are rocked through the means described, the reciprocating toothed bars will be given their reciprocating movement.

Each rocker 41 is provided with two seats 44 and 45 which are normally engaged, as shown, by pins 46 and 47 carried by the Between the pins 46 and 47 each bar actuator is held to the associated rocker by a spring 49, one end of which is connected at 50 to the bar actuator and the other to the rocker at. 51, the construction being such that should the bar actuator be arrested in its movement with the associated rocker, it will tilt about one of the fulcra 46 or 47. The spring 49 which connects each bar actuator to its rocker preferably extends into a recess formed in the bar actuator and as,- sociated rocker, as shown, and since it acts between the fulcra of the bar actuator it normally tends to hold the bar actuator in operative position upon its rocker.

Pivotally mounted on each rocker, as at 52, is a stop finger 53, one end of which'is connected with the associated bar actuator and the other end of -which is associated withmeans for stopping the loom should the stop finger be actuated by, tilting move ment of the associated'bar actuator.

In the present instance of the invention, each stop finger 53 is connected with its bar actuator by a pin and slot connection, as shown. More in detail, the stop finger 53 is provided with a slot 54 which embraces a pin 55 carried by the bar actuator, the construction being such that should the bar actuator be held from movement with its associated rocker by a drop wire, the stop finger will be actuated to stop the loom.

\Vhcre a single bank of drop wires is our ployed, the stop finger may be directly as sociated with the means 'for stopping the loom when the stop finger is actuated by tiltnumber of bar actuators and stop fingers,

and one of the features of the present invention consists of means common to all of the stop fingers to efi'ect loom stoppage when any one of the stop fingers is actuated by its associated bar actuator.

In the present instance there is pivotally mounted on the rockers 41 at each side of the series an arm 56 which may be conveniently pivoted to the associated rocker as at 57, and extending between the outer ends of the arm 56 is'a bar 58 which, as shown, un'derlies all of the stop fingers, whereby should any one of the stop fingersbc actuated or moved relatively to its rocker by relative tilting movement of the bar actuator and rocker, it will operate through the bar 58 to stop the loom..

\Vithin the scope of the present invention, the operative movement of the stop finger toothed bar,

to stop the loom may be utilized in-connection with any form of loom stop mechanism, but in the present instance of the invention, a flexible Wire 59 is employed within the sheath 16 hereinbefore described, and lengthwise movement of the wire in the sheath is utilized the dog 11 to be struck by the hunter 13 when a stop finger is actuated by the bar actuator. As shown in Fig. 3, the sheathed wire 59 passes through a guide 60 formed in the end portion of an arm 61 secured to the rock shaft 29, and a spring 62 is interposed between the bar 58 and the arm 61 to normally maintain the former in its raised position under the ends of the stop fingers. Should the reciprocating bar be arrested in its movement by a drop wire, it will correspondingly arrest its associated bar actuator and cause tilting movement thereof relative to its associated rocker, as illustrated in Fig. 5, and such tilting movement of the bar actuator causes the associated stop finger 53, Fig. 5, to be moved on its associated rocker 41 to move the flexible Wire 59 in its sheath and operatively position the dog 11 to stop the loom. 7

It will be noted from the construction described that the rocking movement. of the bar aetuator relative to its associated rocker will cause one end of the associated stop finger? 53 to be elevated and the other depressed, regardless of the direction of the tilting movement of the bar actuator.

During normal condition of the warp threadslduring weaving, all of the drop wires 36 will be held in raised position to permit full reciprocating movement of the toothed bar 35, but should any warp thread break or become too slack for weaving, then the drop wire associated therewith will drop and arrest ,reciprocating movement of the and through itarrest movement of the bar actuator with its associated rock: er. Such arrest of the latter to tilt on the associated rocker and through the connection with its v,stop finger, actuate the latter to efiect loom stoppage. During normaloperation of the loom with intact warp threads, the rocker or rockers and associated ba'r actuator, the stop finger, or fingers, the arms 56 carrying the bar 58 and the arm 61 carrying the guide for the flexible wire, all move with the associated rocker, but when the associated bar actuator is arrested, its tilting movement operates the associated stop finger to stop the loom.

The construction described affords a convenient and simple construction of mechanisni for stopping the loom when &- warp thread breaks or becomes too slack for weaving purposes.

What is claimed is: 1. In a warp stop mechanism for looms,

to operatively position detector is arrested the bar actuator causes the stop finger is operated by the combination of a series of drop wires normally supported by the warp threads during weaving, a detector having adetecting-movement and adapted to be arrested by a drop wire, a rocker, a detector actuator yieldingly mounted on the rocker for tilting movement about either of two fulcra, a stop finger independently pivoted on the rockerand connected to the detector the latter is tilted by either fulcrum for movement about its pivot thereby when the by a drop .wire, and means operated by thestop finger 'for stopping the loom.

2. In a warp stop mechanism for looms, the combination of a rocker, a bar actuator mounted for tilting movement on the rocker and normally held for such movement, a stop finger mounted on the rocker independent of the bar actuator, connections between the stop' finger and bar actuator to move the stop finger upon its independent mounting relative'to the rocker on tilting movement of the bar a toothed bar connected to the bar actuator for movement thereby, and means operated by the stop finger to stop the loom when movement of the toothed bar is arrested.

3. A warp stop mechanism for looms, comprising, in combination, a toothed bar mounted transversely of the loom and adapted to be arrested by a drop wire, a bar actuator connected to the toothed bar, a rocker on which the bar actuator is mounted and on which it may tilt when the toothed bar is arrested by a drop wire, a stop finger connected to the rocker independent of the bar actuator for movement relative thereto by the bar actuator, and-means operated by the stop finger for stopping the loom when the stop finger is moved relative to the rocker by the bar actuator.

4. In a warp stop mechanism for looms, drop wire detector operating means comprising a rocker, a bar actuator mountedon the rocker for tilting movement relative thereto about either of two fulcra, a stop actuator as actuator on the rocker,

to the bar actuator, and means actuated by the stop finger, for stopping the loom when the bar actuator.

5. In a warp stop'mechanism for looms, toothed bar operating means comprising a rocker. a bar actuator mounted on the rocker for tilting movement relative thereto about either of two fulcra, a stop finger inde pendently mounted on the rocker and connected to the bar actuator, and a sheathed wire actuated by the stop finger for stopping the loom when the stop finger is operated by the bar actuator,

6. In a warp stop mechanism for looms, the combination of a rocker, a bar actuator mounted on the rocker for relative tilting -erated by any one of the stopping the movement about centres at opposite sides of the aXiS of the rocker, a stop finger mounted on the rocker for movement therewith and connected to the bar actuator for movement thereby when the bar actuator istilted on either centre, and means operated by the stop finger for stopping the loom when the stop finger is moved relative to therocker by tilting movement of the bar actuator on the rocker. l

7 In a warp stop mechanism for looms, the combination of a rocker, a bar actuator mounted on the rocker for tilting movement about either of two centres and normally restrained therefrom, a stop finger mounted on the rocker for movement relative thereto and which is given its stopping movement by bodily movement of the bar actuator as it is tilted about either centre and means for stopping the loom' when the stop finger is operated by tiltingmovement of the bar actuator on the rocker.

8. In a warp stop mechanism for looms, the combination of a-rocker, a bar actuator mounted on the rocker for relative tilting movement, a stop finger mounted on the rocker independent of the bar actuator, actuating connections between the bar actuatorand independently mounted stop finger to effect stopping movement of the stop finger by lifting movement of the bar actuator, a normally inoperatively positioned dog-which is placed in inoperative position to stop the loom by the stop finger when the latter is moved relative to the-rocker by tilting movement of the bar actuator on the rocker.

9. In a warp stop mechanism for looms, the combination of a rocker, a bar actuator, two separated pivotal connections between the rocker and bar actuator about either of which the bar actuator may tilt, a stop finger, and connected to the bar actuator for movement thereby as the latter is lifted during its pivotal movement about either centre, a normally inoperatively positioned dog, a sheathed wire between the stop finger and dog to operatively position the dog to stop the loom when the stop finger is moved by tilting movement of the bar actuator relative to the rocker.

' 10. In a warp stop mechanism for looms, the combination of a series of rockers, a bar actuator mounted on each rocker for relative tilting movement, a stop finger mounted on each rocker for movement therewith and connected to a bar actuator, and means opstop fingers for loom when a stop finger is moved relative to the rocker by tilting movement of the connected bar actuator.

11. In a warp stop mechanism for looms, the combination of a series of rockers, a bar actuator mounted on each rocker for relative tilting movement, a stop finger mounted on each rocker for movement therewith and connected to a bar actuator, a yielding bar common to all of the stop fingers for stopping the. loom when any one of the stop fingers is actuated by its associate bar actuator.

12.In a warp stop mechanism for looms, the combination of a series of rockers, a baractuator mounted on each. rocker for relative tilting movement, a stop finger mounted on each rocker for movement therewith and connected. to a bar actuator, a yielding bar constructed and arranged to be, operated by any one of the stop fingers, and a sheathed wire operated by the bar for step ping the loom.

13. In a warp stop mechanism for looms, the combination of a series of rockers, a bar actuator mounted on each rocker for relative tilting movement, a stop finger mounted on each rocker for movement therewith and connected to a bar actuator, a bar, common to all of the-stop fingers, a spring normally acting to hold the bar in position, and means operated through the bar to stop the loom when any one of the stop fingers is move relative to its rocker by tilting movement of the associated bar actuator.

14. In a warp stop mechanism for looms. the combination of a rocker, a bar actuator mounted on the rocker and having a tilting fulcrum at each side of the centre of the rocker, a spring connecting the rocker and bar actuator between the fulcrum of the bar actuator, a stop finger carried by the rocker and operatively connected to the bar actuator, and means actuated by the stop finger for stopping the loom when the stop finger is operated by the tilting movement of the bar actuator.

15. In a warp stop mechanism for looms, toothed bar operating means comprising a rocker. a bar actuator mounted on the rocker for tilting movement relative thereto about either of two centres, a stop finger connected to the bar actuator for movement thereby into stopping position by bodily movement of the bar actuator away from the rocker as it turns about either centre, a yielding member mounted on the rocker and constructed and arranged to be moved by the stop finger 4 and means actuated by said yielding member to stop the loom.

16. In a .warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, a detector having a detecting movement and ada ted to be arrested by a drop wire when the atter fails to be sup ported by a warp thread during weaving, a rocker having a supporting surface, a detector, actuator mounted for tilting movement about separate points of the supporting surface of the rocker and normally restrained from said tilting movement until the detector is arrested by a drop wire, a stop finger connected to the detector actuator and movable to stopping position by the lifting movement of the detector actuator as it is bodily 'moved relative to the rocker about either of said points When the detector and its actuator are arrested by a drop Wire, and means operated by the stop finger for stopping the loom when the stop finger is operated by the detector actuator.

17. In a Warp stop mechanism for looms, the combination of a drop Wire detector, a rocker, a detector actuator mounted on the rocker for tilting movement about centres, one at each side of a plane passed through the axis of the rocker and longitudinal centre ofthe actuator, yielding means normally acting to maintain the rocker and actuator seated on both centres, a stop finger, connections between the stop finger and actuator to effect stopping movement of the former by movement of separation of the actuator and rocker as the actuator turns on either centre.

18. In a- Warp stop mechanism for looms, the combination'o'f a drop vvire detector, a

rocker and detector actuator having interengaging portions constituting tilting centres at each side of a plane passed through the axis of the rocker and longitudinal centre of the detector actuator about either of Which they may relatively tilt, and a stop finger connected to the detector actuator to efiect stopping movement of the stop finger by tilting movement of the detector actuator about either centre.

19. In a warp stop mechanism for looms, the combination of a drop Wire detector, a rocker, rocker for movement about either of two centers, a stop finger pivotally supported and connected to the detector actuator between said centers to etl'ect stopping move- 1nent of the stop finger by separating movement of the rocker and detectoractuator.

a detector actuator seated upon the- In testimony whereof, We have signed our names to this specification.

HARRY A. DAVIS. ARTHUR S. JUHNSON. 

